Thermal Conductivity Measurement at 40K Designing a Cryogenic Test Bench

Details Thermal Conductivity Measurement at 40K Designing a Cryogenic Test Bench Thermal Conductivity Measurement at 40K Designing a Cryogenic Test Bench

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..515r&link_type=abstract

Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-

Computer Science

Scientific paper

The PLANCK telescope is designed for operating temperatures in the range of 40 K to 300 K. In order to characterise its interface behaviour under such a large temperature range, a dedicated test campaign has been performed in Alcatel Cannes premises, aiming at measuring the thermal conductivity of the interface. These tests are based on the measurement of temperature gradient induced by power injection on the specimen during a thermal equilibrium. For this purpose, two representative samples have been built and integrated in a dedicated test bench so-called C2. This facility is an under-vacuum cryostat with two temperature levels : 77 K achieved with liquid nitrogen shrouds 4.2 K with liquid helium shrouds and dedicated cooling support. Thermal conductance measurements are thus performed under 10-7 HPa vacuum. This paper presents the test configuration detailing the solution developed in order to optimise the thermal coupling between the specimen and its support. The difficulty is to stabilise the specimen at 40 K, when the test support and the radiative environment are closed to 4K. The first test results are also presented and the total accuracy of this method is evaluated : 0.03 W/K measured at 40K with a maximum dispersion of +/- 0.5K and a stability of +/- 1K during 0.5 hour.

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